

# def a():
#     print("函数 a")
# def b():
#     print("函数 b")
#     a()
# def c():
#     print("函数 c")
#     b()
# def d():
#     print("函数 d")
#     c()
# d()



# def a():
#     nums = 10
#     print("函数 a")
# def b():
#     nums = 20
#     a()
#     print("函数 b")
# def c():
#     nums = 30
#     b()
#     print("函数 c")
# def d():
#     nums = 40
#     c()
#     print("函数 d")
# d()
#
#
